Science
Mechanism of Action
As a surfactant, Octoxynol-33 functions by lowering the surface tension between different phases, facilitating the formation of stable emulsions. This action is crucial for dispersing oil and dirt in water, allowing for effective rinsing in cleansing products. Additionally, its longer-chain structure endows it with hydrotropic capabilities, enhancing the solubility of other compounds that typically resist dissolution in a given solvent.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
No specific optimal pH range for the stability of Octoxynol-33 has been identified in the provided research. Given its synthesis under elevated temperature, pressure, and with NaOH, formulators should focus on minimizing impurities such as heavy metals and ethylene oxide in final cosmetic products, adhering strictly to established regulatory limits for product integrity and safety.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that long-chain octoxynols, including Octoxynol-33, are safe for use in both rinse-off and leave-on cosmetic formulations when precisely formulated to be non-irritating. This determination was re-affirmed in an amended report issued in March 2025. It is important to note that while the FDA has approved Octoxynol-33 for indirect food contact applications, its use in Europe is subject to authorization, as octoxynols are classified as 'substances of very high concern' due to documented toxicity to aquatic life with long-lasting environmental effects.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Octoxynol-33 is a valuable functional ingredient for cosmetic formulation, serving effectively as a surfactant and solubilizer, with its safety profile affirmed by CIR for cosmetic use when formulated to be non-irritating, despite specific environmental concerns in European regulations.
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References
Sources